4221644 has 48 divisors (see below), whose sum is σ = 9172800. Its totient is φ = 1693440.

The previous prime is 4221643. The next prime is 4221649. The reversal of 4221644 is 4461224.

It is not an unprimeable number, because it can be changed into a prime (4221641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23234 + ... + 23414.

It is an arithmetic number, because the mean of its divisors is an integer number (191100).

Almost surely, 2^4221644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4221644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4586400).

4221644 is an abundant number, since it is smaller than the sum of its proper divisors (4951156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221644 is a wasteful number, since it uses less digits than its factorization.

4221644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 207 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 4221644 is about 2054.6639627929. The cubic root of 4221644 is about 161.6195410641.

Adding to 4221644 its reverse (4461224), we get a palindrome (8682868).

The spelling of 4221644 in words is "four million, two hundred twenty-one thousand, six hundred forty-four".